Books published before a certain year (generally before 1928 in most of the world) are in the public domain. Many classic Christian works are available for free.

Use these exact phrases to find university/church-hosted public domain PDFs:

"carte creștină" "pdf" "public domain" filetype:pdf
"Pelerinul" John Bunyan pdf gratuit
intitle:index.of "pdf" creștin

Avoid: "download free full" + "torrent" + "rar" – those are often pirated or malicious.

Several Romanian websites legally offer free PDFs of out-of-print or religiously approved texts.

Use these search phrases in Google (without quotation marks around the whole phrase, but use them for exact matches):

Avoid search terms like “free download full crack” or “pdf drive” – those often link to pirated content.